Date: Thu, 26 Feb 2009 13:33:18 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r189063 - head/sys/kern Message-ID: <alpine.BSF.2.00.0902261331250.41191@fledge.watson.org> In-Reply-To: <20090226134937.13523qtfgxc9ik7k@webmail.leidinger.net> References: <200902261056.n1QAuDTL025375@svn.freebsd.org> <alpine.BSF.2.00.0902261056280.16988@fledge.watson.org> <20090226134937.13523qtfgxc9ik7k@webmail.leidinger.net>
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On Thu, 26 Feb 2009, Alexander Leidinger wrote:
>> A typical tracing command might be:
>>
>> dtrace -n 'priv:::priv_ok { trace(execname); trace(arg0);}'
>>
>> arg0 requires manual interpretation using /usr/include/sys/priv.h.
>
> Theoretically it is possible to write a little script which takes priv.h and
> generates a little bit of dtrace stuff which allows to print out strings
> instead of numbers. But I think this is a matter of motivation...
>
> I would also use printf("program: %s, priv: $d\n", execname, arg0) or
> something similar with printf, but this is cosmetics.
>
> Should we create a repository of dtrace scripts in /usr/share or wherever?
> For the linuxulator I have several scripts in my linuxulator-dtrace branch
> (some more, some less useful for non-developers).
I have a couple up on the wiki on the DTrace/Examples page from some
callout-related profiling I was doing, but some sort of more formal library
would be good. I guess the question is "how productionable do we want them to
be" -- if they're just fragments then a wiki or the tools tree might be good;
if it's really going to be a formal set of analysis tools with consistent
interface, style, and maintained over time then usr/share would be better, but
I think having consistency in approach and content would be something very
much to encourage.
Robert N M Watson
Computer Laboratory
University of Cambridge
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